drm/armada: update primary framebuffer parameters on mode change

The framebuffer base address and toggling mode needs to be updated
when the interlaced flag for mode changes is updated.  Arrange to
reprogram these parameters when only the mode has changed.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

drivers/gpu/drm/armada/armada_plane.c

@@ -184,11 +184,13 @@ static void armada_drm_primary_plane_atomic_update(struct drm_plane *plane,
 		armada_reg_queue_set(regs, idx, val, LCD_SPU_GZM_HPXL_VLN);
 	if (old_state->src.x1 != state->src.x1 ||
 	    old_state->src.y1 != state->src.y1 ||
-	    old_state->fb != state->fb) {
+	    old_state->fb != state->fb ||
+	    state->crtc->state->mode_changed) {
 		idx += armada_drm_crtc_calc_fb(state, regs + idx,
 					       dcrtc->interlaced);
 	}
-	if (old_state->fb != state->fb) {
+	if (old_state->fb != state->fb ||
+	    state->crtc->state->mode_changed) {
 		cfg = CFG_GRA_FMT(drm_fb_to_armada_fb(state->fb)->fmt) |
 		      CFG_GRA_MOD(drm_fb_to_armada_fb(state->fb)->mod);
 		if (drm_fb_to_armada_fb(state->fb)->fmt > CFG_420)